00000cab a22000004a 4500 IPP-00000266571 IPP 20180816101210.0 180816s2010 xx d | ||r |||||eng|| eng Linaugo, Joji D. Physico-chemical and bacteriological assessment of Bago River, Negros Ocidental 2010 The Bago River in Negros Occidental, Philippines was surveyed July to September 2009 (wet season) and February to April 2010 (dry season). The timing of the dry season survey coincides with the occurrence of El Niño phenomenon. Measured in-situ were depth, width and surface water velocity for hydrological and dissolved oxygen, humidity, pH, salinity and temperatures of both air and water subsurface for physico-chemical characteristics. Water samples were tested for conductivity, nitrates, phosphates, total dissolved solids, total suspended solids, and turbidity in the laboratory. Total coliform and thermo-tolerant (fecal) coliform counts were also determined. Based on Dao 34, the water of Bago River can be classified as Class AA for dissolved oxygen, pH, phosphates and total dissolved solids; Class B for nitrates and total suspended solids; and Class D for total and fecal coliforms. Volume of water was lower during the dry season that brought some significant differences (using t-test) in the following parameters: atmospheric temperature (p=0.005); sub-surface temperature (p=0.035); humidity (p=0.000); salinity (p=0.000); nitrate (p=0.000); and phosphate (0.048). The high level (2,200-16,000,000 MPN/100 ml) of coliform readings can be attributed to the observed use of the river as dumping site of human and agricultural wastes. cultivation near the upper three sampling areas and slash and burn farming in the vicinity of uppermost station might have contributed to high levels of nitrates and total suspended solids. It is recommended that local government units create and strictly implement measures regulating these activities. Watersheds Turbanos, Ferdinand M. Pacalioga, Jessica O. Patiluna, Ma. Lotus E. Menes, Carmen Silliman Journal Vol. 51, no. 1 (Jan. 2010 - Jun. 2010), 21-40 Article FI